Radio support panel



y 1929. E. G. D'ANIELSON 1,713,951

RADIO SUPPORT PANEL Filed June 16, 1926 2 Sheets-Sheet 1 III YEN TOR. Ar/7257 6. flame/500.

A I Tronns y 21, 1929- E. G. DANIELSON 1,713,951

RADI O SUPPORT PANEL Filed June 16, 1926 2 Sheets-Sheet 2 INYENTOI?5/7652 6 Dal/$7 Patented May 21, 1929.

UNITED STATES ERNEST G. DANIELSON, 01' SAN CALIFORNIA- BADIO SUPPORTPANEL.

Application filed June 18,

This invention relates generally to devices intended to serve as asupport or mounting for electrical instruments and is especially adaptedfor radio receiving apparatus.

In radio receiving apparatus it is often diflicult to tune out a localstation in order to permit long distance reception. It has been foundthat this difiiculty is not altogether due to harmonics transmitted bythe local station or to poorly designed tuning circuits in the receivingapparatus, but is also caused by stra s which are absorbed by theunshielded coils and electrical conductors of a receiving set. It hasaccordingly been found that by effectively shielding the coils andconductors of a set, much closer tuning may be obtained, interference isreduced to a minimum and the stability of the receiver is generallyincreased.

It is an object of this invention to devise a novel and practical meansfor shielding the conductors interconnecting the various instruments ofa radio set.

It is a further object of this invention to provide a shield for theinterconnecting conductors of a radio set which is in the form of apanel support upon which the instruments are mounted. It is proposed toconstruct the panel of a pair of superposed metal sheets adapted toenclose themajor portions of the con uctors.

Further objects of the invention will appear from the followingdescription in which I have set forth the preferred embodiment of myinvention. It is to be understood that the scope of this invention is tobe determined from the appended claims andthe state of the prior art.

Referring to the drawings:

Figure 1 is a plan view of apanel supa! port embodying the features ofthis invention.

'Fig. 2 is a bottom view of the panel 1928. Serial No. 116,378.

at various points to receive the interconnectmg electrical conductorsfor the various instruments. The lower sheet is provided w thpressed-out grooves which together with the upper sheet, formpassageways for receiving the conductors.

Thus referring to the drawings, there is shown a support panel 10 uponwhich are mounted the various instruments of a radio set indicated inthe drawing by dotted line construction. In order to illustrate themanner m which the invention is incorporated w1th a representative typeof radio receiving set, there has been indlcated a plurality of electronemission tubes 11, radio frequency coupling coils 12, variable tunmgcondensers 13, and audio frequency transformers 14. With such receivingsets the interconnecting electrical conductors between the instrumentsform a considerable absorbing capacitance which if not shielded Wlllabsorb the energy of strays, with the result that the receiver will notbe able to select a distant station to the exclusion of a near-by localstation of different wave length. To obviate absorption of energy by theinterconnecting conductors and in order to shield certain of theconductors from each other, the support panel 10 is made of metal andcomprises upper and lower sheets 16 and l7 secured together insuperposed relationship. The majority of the instruments may be mounteddirectly upon the upper sheet 16 and this sheet is rovided witha'plurality of apertures 18 w ich are located adjacent the instrumentconnection terminals. In wiring the apparatus the electrical conductors19 interconnecting the various instruments are extended through theapertures 18 so as to underlie the upper sheet 16 for the greaterportion of their length.

In order to shield certain of the conductors from each other the lowersheet 17 is preferably provided with suitable pressedout grooves 20which together with the upper sheet 16 form passageways 21 for receptionof the conductors 19. In this manner certain of the conductors may beentirely enclosed and segregated from the other conductors in order toprevent physical shiftling of the conductors and intercapacitativecoupling. Thus for example it is desirable to separately shield the gridconductors 19 which are at a relatively high potential. In practiceregistering apertures 22 and 23 comprising a pair of may he provided inthe upper and lower sheets for receiving the screws or bolts used inmounting the various instruments. For clamping the upper and lowersheets togethercertain of the instrument mounting screws 24 may beextended down below the lower sheet 17 and nuts 2-5 employed forretaining the lower sheet in contact with the upper. A flange 26 is alsopreferably provided around the edge of the upper sheet 16 in order toadd to the appearance of the device and to aid in positioning the lowersheet 17 with respect. to the upper sheet. \Vhen in use the panel isusually grounded so that it is maintained at substantially zeropotential. Other portions of the apparatus may also be shielded asindicated by the metal covers 27 for the radio frequency coupling coils12.

I claim:

1. A panel support for radio apparatus comprising a plurality ofsuperposed metal sheets, at least one of said sheets being groovedtoprovide passageways for conconductors interconnecting individualinstruments of the apparatus.

2. A panel support for radio apparatus comprising a pair of superposedmetal sheets, the lower sheet being provided with pressed out grooves toprovide passageways between the sheets for conductors intercon nect-ingcertain of the instruments of the apparatus.

3. A panel support for radio apparatus superposed metal sheets, thelower sheet being provided with a plurality of spaced pressed outgrooves to provide spaced passageways between the sheets, the uppersheet being provided with apertures communicating with said grooveswhereby certain of the conductors connecting the instruments of theapparatus may be segregated and shielded by positioning the same in saidpassageways.

4. A panel support for radio apparatus comprising a pair of superposedmetal sheets forming electrostatic shields, the lower sheet beingprovided with a plurality of spaced pressed out grooves to providespaced passageways between the sheets, the upper sheet being providedwith apertures communicating with said grooves whereby certain of theconductors connecting the instruments of the apparatus may be segregatedand shielded by positioning the same in said passageway.

5. A panel for supporting the electron relays of radio apparatus, saidpanel comprising an upper metal sheet upon which said relays aresupported, apertures in said sheet thru which grid leaks to said relaysare strung, said leads thereby extending for a substantial distancealong the lower surface, and another metal sheet clamped against thelower face of said first sheet, said lower sheet being grooved toaccommodate the'portions of said conductors extending along the lowersurface of the first sheet, said sheets serving to substantiallyencompass said conductors with metal shielding.

In testimony whereof, I have hereunto set my hand.

ERNEST G. DANIELSON.

